I have a project Firepower with a slew of issues. I've been working on this particular issue for a few hours and I think it's time to call on the experts. The sound board that came with the game was sold as broken. I bought another board that was advertised as working. It was not tested. I transferred the speech card and ROM to the supposed working board. Speech works in game as well as in test. There is no in game sound. If I ground the pins of 10J3 the only sound I get is voice. Here is what I've done so far.
Replaced ROM socket
Reflowed all of the header pins
Confirmed all jumpers were the same as the original board
Checked voltages- 5v was a little low 4.89, -13.67, +12.22
Pin 37 of CPU shows activity with the logic probe
The ROM appears to be original with a factory label. (SOUND ROM 3). I put it in my burner and it verified. Here is the odd part, I tested it as a 2716, not a 2516. Not sure why it verified. This part of the tech I'm a bit blurry on.
Thanks!